Insulator



(No Model.)

A. L. JOHNSTON.

INSULATOR.

- Patented Feb. 14, 1893.

mm Z M f 1 J Unnrnn STATES PATENT OFFICE.

ANDREIV LANGSTAFF JOHNSTON, OF RICHMOND, VIRGINIA.

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 491,890, dated February14., 1893.

Application filed May 4, 1892. Serial No. 431,771- (No model.)

T0 00% whom it may concern:

Be it known that I, ANDREW LANGSTAFF JOHNSTON, a citizen of the UnitedStates, residing at Richmond, in the county of Henrico and State ofVirginia, have invented certain new and useful Improvements inInsulators for Electric Conductors, of which the following is so full,clear, and exact a specification as will enable those skilled in the artto which this invention appertains to make and use the same, referencebeing had to the accompanying drawings, forming a part hereof.

This invention relates to certain new and useful improvements ininsulators for all kinds of electric conductors, the object being toproduce an insulator which will properly support the wire, and yet atthe same time will present perfect insulation.

In the accompanying drawings forming a part of this specification, andon which similar letters of reference indicate the same or correspondingfeatures, Figure 1, is a vertical sectional view of the form ofinsulator used for the ordinary telegraph pole. Fig. 2, is across-section thereof. Fig. 3, is a vertical sectional View of amodified form of insulator to be used more especially for the holding ofthe trolley wire of electric railroads, and Fig. 4, is a cross-sectionthereof.

The letter A, represents a pin extending upwardly from one of the armsof a telegraph pole and the letter B, the body of the insulator,constructed of some insulating material in the present instance of woodand having its lower end terminating in a downwardly extending tip C sothat in moist or wet weather the water will collect at these points anddrip off. The body 13, is provided at its upper end with a cap D the topof which is made round so that the moisture will run off at the sides.

The interior of the insulator is cut out as shown in Fig. 2, and thebody, (in the present instanoe,) constructed of wood, I boil inparaffine or other suitable material so as to make the insulation moreperfect and the wells E E I fill with oil or other non-conductingliquid.

The wire-hanger orholder proper for the line wire has three legs F, G,and H, the two former or those upon which it stands in the wells andwhich support the weight of the wire, and the latter II, is the onewhich carries or holds the line wire, said latter terminating in an eyeJ, through which the wire passes. As shown in Fig. 1, I provide asemicircular strip K, which fits over the leg H, and is fastened tothe'line wire by the bands L, L.

Fig. 4:, shows a modified form of my insulator, which is the formconstructed especially for the use of those electric railroads which usethe trolley or overhead system. The letter M, in this figure refers toan eye by which the insulator is held or suspended and the letter N, tothe extended leg (being an extension of the leg II in Figs. 1, and 2);this extended leg is pivotally connected by a bolt at its lower end tothe tubular fastener or holder 0, and this latter is what immediatelysupports the trolley wire. It will be observed in this modification, Ihave shown the short legs as provided with feet P, which feet are madejust so large that they can be slipped into the wells E, E, by pushingthem down side-wise but it would be impossible to extract or push themout of place by a direct upward movement, and for this reason in someinstances it is found desirable.

The body of my insulator is shown of a somewhat different configurationin Figs. 3 and 4t, and it is found in this form to be somewhat cheaperto manufacture.

Having thus fully described myinvention, what I claim as new and desireto secure by Letters Patent, is

' 1. In an insulator the combination with the body thereof provided witha well for the reception of a non-conducting liquid, of a wirehangersuspended therein, said hanger having three legs, two of which fit inthe well and the third of which carries the wire.

2. In an insulator the combination with the body thereof provided with awell for the reception of a non-conducting liquid, of a wire hanger orholder suspended therein, said hanger having three legs, two of whichfit in the well, and the third of which is extended and carries the wireat its lower end.

3. In an insulator the combination with the body thereof terminating atits lower end in a sharply rounded edge from which the moisture candrip, provided with an interior well for the reception of anon-conducting liquid, of a wire hanger suspended therein and a cap tocover the same.

4. In an insulator the combination with the body thereof of a wirehanger suspended therein, said hanger having three legs, two of whichfit in the body and the third of which carries the wire.

In testimony whereof I affix my signature in (5 the presence of twowitnesses.

ANDREW LANGSTAFF JOHNSTON. Witnesses:

WALTER V. CHURCH, GILBERT H. GREEN.

